Run with -mno-ms-bitfields if the compiler supports it as the ms-bitfields are turned on by default on some hosts, but they are broken https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52991

git-svn-id: http://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3869 ed541006-0bf7-43e9-8c4d-6fc63c346d47